multiple-pipeline: skip the Echo Reference pipeline in the test

In this case, if we test all capture pipelines at same time, but
capture pipeline count is less than requested count defined by
-c option, playback pipeline will be started to ensure requested
number of pipelines are running in parallel.

Considering this scenario, the capture pipeline count is less than
requested count and the tplg contains both Smart Amp pipeline and
Echo reference pipeline, if the Echo reference pipeline start first
and Smart Amp pipeline start next, this will cause the ipc tx times
out. This patch skips the Echo reference pipeline to avoid such case

Signed-off-by: Keqiao Zhang <keqiao.zhang@intel.com>

Author: keqiaozhang

test-case/multiple-pipeline.sh

@@ -84,10 +84,15 @@ APP_LST['capture']='arecord_opts'
 DEV_LST['capture']='/dev/null'
 
 # define for load pipeline
+# args: $1: playback or capture
+#       $2: optional filter
 func_run_pipeline_with_type()
 {
+    local direction="$1"
+    local opt_filter
+    [ -n "$2" ] && opt_filter="& $2"
     [[ $tmp_count -le 0 ]] && return
-    func_pipeline_export "$tplg" "type:$1"
+    func_pipeline_export "$tplg" "type:$direction $opt_filter"
     local -a idx_lst
     if [ ${OPT_VAL['r']} -eq 0 ]; then
         idx_lst=("$(seq 0 $((PIPELINE_COUNT - 1)))")
@@ -105,7 +110,7 @@ func_run_pipeline_with_type()
 
         dlogi "Testing: $pcm [$dev]"
 
-        "${APP_LST[$1]}" -D "$dev" -c "$channel" -r "$rate" -f "$fmt" "${DEV_LST[$1]}" -q &
+        "${APP_LST[$direction]}" -D "$dev" -c "$channel" -r "$rate" -f "$fmt" "${DEV_LST[$direction]}" -q &
 
         : $((tmp_count--))
         if [ "$tmp_count" -le 0 ]; then return 0; fi
@@ -165,11 +170,11 @@ do
         'p' | 'a')
             tmp_count=$max_count
             func_run_pipeline_with_type "playback"
-            func_run_pipeline_with_type "capture"
+            func_run_pipeline_with_type "capture" "~pcm:Amplifier Reference"
             ;;
         'c')
             tmp_count=$max_count
-            func_run_pipeline_with_type "capture"
+            func_run_pipeline_with_type "capture" "~pcm:Amplifier Reference"
             func_run_pipeline_with_type "playback"
             ;;
         *)